> BTW, anybody knows how I could scale the radius of the twisted cylinder?

Oh and I forgot, here is the function:
function { 
  x*cos((z+2*clock)*2*pi) + x^2 + 
  y*sin((z+2*clock)*2*pi) + y^2
}

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in article 3DE0162E.4A5400D2@no_spam.com, Simon Lemieux at
no_### [at] no_spamcom wrote on 23/11/02 11:58 pm:

> Hi there!
> I posted an image called SuperSinusoidal, I wanted to make it into an
> IFS some day but figured it could not be done that way.  So, I decided
> to learn about isosurface and try to recreate my IFS with it...
> 
> Here is my first start.
> 
> BTW, anybody knows how I could scale the radius of the twisted cylinder?
> 
> Thanks,
> Simon

Hi Simon, you should post any binary files to p.b.* (povray.binaries.*). In
this case, you should have posted this one to povray.binaries.images.

Best Regards

Fidel.

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in article 3DE01727.420BE516@no_spam.com, Simon Lemieux at
no_### [at] no_spamcom wrote on 24/11/02 12:02 am:

>> BTW, anybody knows how I could scale the radius of the twisted cylinder?
> 
> Oh and I forgot, here is the function:
> function { 
> x*cos((z+2*clock)*2*pi) + x^2 +
> y*sin((z+2*clock)*2*pi) + y^2
> }

The most appropriate group for this discussion would be p.a-u
(povray.advance-users).
This one is for discussing animation.

All the best

Fidel.

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Wasn't it Simon Lemieux who wrote:
>> BTW, anybody knows how I could scale the radius of the twisted cylinder?
>
>Oh and I forgot, here is the function:
>function { 
>  x*cos((z+2*clock)*2*pi) + x^2 + 
>  y*sin((z+2*clock)*2*pi) + y^2
>}

Depending on what you mean by "scale", you might want to do something
like this to cause the radius to vary linearly as z changes

#declare  F = function { 
  x*cos((z+2*clock)*2*pi)*(z-A)/B + x*x + 
  y*sin((z+2*clock)*2*pi)*(z-A)/B + y*y
}

[I've also changed the syntax from being MegaPov specific to something
that will also work in POVRay, so that I could test it].

Where "A" specifies the point along the z axis where the radius would
become zero, and B controls the rate at which the radius reduces.


If you just want to scale the while thing, then you'll find the "scale"
keyword useful. It still works with isosurfaces.

-- 
Mike Williams
Gentleman of Leisure

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> Hi Simon, you should post any binary files to p.b.* (povray.binaries.*). In
> this case, you should have posted this one to povray.binaries.images.

Thanks for noticing me Fidel, I just didn't know I made the mistake of
sending it to povray.animations instead of povray.binaries.animations!

Oh, and an animated GIF is considered an Image? or an animation? I
thought it would be the latter...

Thanks!
  Simon

Post a reply to this message

Fidel viegas wrote:
> 
> in article 3DE01727.420BE516@no_spam.com, Simon Lemieux at
> no_### [at] no_spamcom wrote on 24/11/02 12:02 am:
> 
> >> BTW, anybody knows how I could scale the radius of the twisted cylinder?
> >
> > Oh and I forgot, here is the function:
> > function {
> > x*cos((z+2*clock)*2*pi) + x^2 +
> > y*sin((z+2*clock)*2*pi) + y^2
> > }
> 
> The most appropriate group for this discussion would be p.a-u
> (povray.advance-users).
> This one is for discussing animation.

Yes, of course!  Though I wasn't really looking for disscussing, but
rather sharing my start with the isosurface and btw asking a question...

Thanks Fidel,
  Simon

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> Depending on what you mean by "scale", you might want to do something
> like this to cause the radius to vary linearly as z changes

Well, I was thinking of a permanent scale, like a cylinder and not like
a cone, as you showed me...

> #declare  F = function {
>   x*cos((z+2*clock)*2*pi)*(z-A)/B + x*x +
>   y*sin((z+2*clock)*2*pi)*(z-A)/B + y*y
> }

I think I get it, though I would have to test it to be sure...  I wish I
had time to spend again on this project...  Maybe this weekend!

> [I've also changed the syntax from being MegaPov specific to something
> that will also work in POVRay, so that I could test it].

Yes, thanks, I didn't know about it, but I'll use it from now on... (Do
you know of other MegaPOV VS POV3.5 changes regarding isosurfaces?)

> If you just want to scale the while thing, then you'll find the "scale"
> keyword useful. It still works with isosurfaces.

No, no... I'd prefer to keep it in math and less povray code.

Thanks a lot Mike,
  Simon

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Simon Lemieux wrote:

> Oh, and an animated GIF is considered an Image? or an animation? I
> thought it would be the latter...

For the purposes of this news server we consider animated gifs as a binary
animation file and therefore they should be posted in the binaries.animations
group.

-- 
Ken Tyler

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Wasn't it Simon Lemieux who wrote:
>
>Yes, thanks, I didn't know about it, but I'll use it from now on... (Do
>you know of other MegaPOV VS POV3.5 changes regarding isosurfaces?)
>

Yes, and I've written them all down for you at 
<http://www.econym.demon.co.uk/isotut/pov35.htm>


-- 
Mike Williams
Gentleman of Leisure

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in article 3DE82FE3.2EFE0C7D@no_spam.com, Simon Lemieux at
no_### [at] no_spamcom wrote on 30/11/02 3:26 am:

>> Hi Simon, you should post any binary files to p.b.* (povray.binaries.*). In
>> this case, you should have posted this one to povray.binaries.images.
> 
> Thanks for noticing me Fidel, I just didn't know I made the mistake of
> sending it to povray.animations instead of povray.binaries.animations!
> 
> Oh, and an animated GIF is considered an Image? or an animation? I
> thought it would be the latter...

Any binaries you should post to p.b.*

Animations you post to p.b.a, images p.b.i, etc...


All the best

Fidel.

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